HONEYWELL霍尼韦尔执行器M7285执行器M7285A1003

HONEYWELL霍尼韦尔执行器M7285执行器M7285A1003
产品资料：
check the operation using the same method as for 
overvoltage.
Example: For monitoring mode set to three-phase three-wire 
monitoring, a rated voltage of 200 V, and an operating time 
of 5 s.
Note: K8AB-PM@ output relays are normally operative.
Connection Diagram 1
How to Measure the Operating Time
Overvoltage
Change the input suddenly from 0% to 120% of the set 
value and measure the time until the Unit operates.
Undervoltage
Change the input suddenly from 120% to 0% of the set 
value and measure the time until the Unit operates.
Operating Time
Adjust the slide resistor so that the voltage applied to the 
K8AB terminals is 120% of the set value (for overvoltage 
detection) and 80% of the set value (for undervoltage 
detection) when the auxiliary relay operates, as shown in 
connection diagram 2. Close the switch and use the cycle 
counter to measure the operating time.
Connection Diagram 2
Checking the Phase Sequence and Phase Loss 
Operation
Phase Sequence
Switch the wiring, as shown by the dotted lines in 
connection diagram 1, to reverse the phase sequence and 
check that the K8AB operates.
Phase loss
Create a phase loss for any input phase and check that the 
K8AB operates.
Operating Adjustment Knobs 
Use a screwdriver to turn the knobs. There is a stopper to 
prevent the knob from turning any further once it has been 
turned completely to the left or right. Do not force the knob 
past these limits.
Load-side Phase Loss
In principle, phase loss cannot be detected on the load side 
because the K8AB-PM@ measures three-phase voltage to 
determine phase loss.
Motor Load Phase Loss during Operation 
Motor load phase loss cannot be detected during operation. 
It can be used to detect phase loss at startup.
Normally, three-phase motors will continue to rotate even if